Richard huffman



(No Model.) 7

-R. HUFFMAN. DRILL.

No. 548,551. Patented Oct. 22, 1895.

giwvawboz I UNITED STATES PATENT- Orrrcn.

E. J. BALDWIN,

or SAME PLACE.

.DRlLL.

SPECIFICATION forming part of Letters Patent No. 543,551, dated October 22, 1895. Application filed August 29 1895. ,Serial No. 560,923. (No model.)

This invention relates to st0ne-working, and

more especially to that class of tools used therein which are known as fdrills, and the object of the same is to effect certain improvements in devices of this character.

To this end the invention consists in the details of construction hereinafter described and claimed, and as shown in the accompanying drawings, wherein- Figure 1 is a front side elevation of the drill with the screw within the tube and the drill point or bit in position ready for operation on the rock. Fig. 2 is a central horizontal section showing the screw as run out of the tube and the bit embedded in the rock. Fig. 3 is a perspective detail of the intermeshin g wheels with one of them partly in section to show the interior springs for projecting its teeth. Fig. 4 is an elevation of the outer face of the grooved wheel, showing how the crank may be used to start the screw back into the tube when the bit is in the rock. Fig. 5 is a side elevation of a portion of the toothed wheel, partly broken away to show a tooth.

Referring to the said drawings, the letter F designates a frame of any approved material and construction, as iron tubing, having at its outer end a head F, for a purpose to appear hereinafter, and at its inner end a foot f, connecting the top and bottom bars of the frame and having a central and preferably square aperture between them.

Ti s a long and preferably square tube capable of sliding through said aperture in the foot and carrying near its rear end a rest R, adapted to rest, against the drill-frame (not shown) or some'othersuitable support. Near the forward end of this tube are guide-lo gs L, projecting above and below and either having forks Z at their outer ends sliding along the bars of the frame, as shown, or entering slots in said bars, as will be clear, their purpose being to hold the forward end of the tube centrally between such bars at all times and yet permit it to move longitudinally therein.

The letter N designates a nut removably secured in the open front end of the tube by a set-screw n, and S is a long screw taking through this nut and extending within the body of the tube, the forward end of the screw being journaled through the head F, as seen in Fig. 2,and carrying a drill-chuck B for the removable reception of the drill point or hit B, as will be clearly understood. Thus when the screw is turned in the proper direction it will be seen that it will be drawn out of the nut and tube and will force the entire frame and bit away from the tube and the support against which the latter rests, while at the same time turning the bit as the latter progresses forward.

Secured fast on the screw S just in rear of the clamp or clutch B is a wheel G, (best seen in Figs. 3 and 4,) whose edges are milled, as at G, whose rear face is provided with a number of radial ratchet-grooves g, with one vertical wall and the other inclined, as shown, and whose front face is provided with a num ber of forwardly-projecting squared lugs g", for a purpose to appear below.

R is a wheel mounted in an opening in the head F and fixed on its shaft 0, which latter is squared at its front end for the reception of a crank-handle O, as will be clear. This wheel is provided (see Figs. 3 and 5) with a number of radial openings in its periphery, as seen at B each forming a cavity, within which is seated an expansive spring R and around the periphery of the wheel is secured a band or tire R, having openings R smaller in diameter than said cavities, but concentric therewith.

r is a tooth seated in each cavity and having a beveled outer end r, its inner end having an enlarged head o of the size of the cavity, while its body is of the size of the opening R in the tire. Although I have described and shown this means for forcing the teeth normall y outward, yet preventing their complete displacement, any other suitable means may be employed, it being only necessary that the fiat faces of the teeth shall contact with the vertical walls of the grooves g, whereby thewheel G (and with it the screw and bit) is turned forward when the crank O is turned to the right, but will not be moved when the crank is turned to the left or reversed, since the teeth will then yield and the springs be compressed within the openings R In operation the parts are first arranged as seen in Fig. 1, and a bit inserted which is of to the proper diameter and with a pitch to its threads greater than that of the screw S, and a suitable support is brought to bear against the rest R. The crank U is then turned to the right by the operator, who stands along- [5 side the frame, and this movement turns the toothed wheel R so that its teeth engage the grooves in wheel G, while the rotation of this wheel turns the bit and screw. As the point of the bit forms a hole in the face of the rock the screw slowly draws out of the nut N and tube '1, pushing the frame forward on said tube and feeding the bit to the rock as the hole therein is formed. Since the bit rotates faster than it advances, the borings will be wormed out of the hole as it is formed and will not choke or stop the movement of the bit. \Vhen the bit is sunk for nearly its complete length, it will be obvious that the crank C will strike the rock and cannot longer make 0 complete revolutions, and then it is that the spring-pressed teeth 0" become useful, because after turning the crank through half a revolution it can be turned back for a new bite and its teeth 0" will slip over the grooves g, as is clear. 5 When the frame has been advanced as far as possible in this way, the crank-handle is removed from the squared end of the shaft 0 and placed on one of the lugs g,in which position it is used to start the grooved wheel 40 G, bit B, and screw S backward. As soon as the point of the bit has been drawn out of the accumulated borings the crank is removed and the wheel rapidly rotated to the rear by its millings G, and this movement very 5 quickly runs the screw back into the tube and withdraws the bit from the hole in the rock, or, if preferred, after the bit has been loosened the set-screw n is withdrawn and the screw S turned until the nut N is cleared of the forward end of the tube, after which this nut can be quickly run back on the screw and the tube shoved back to its initial position,the nut inserted, and the set-screw replaced. Thereafter a longer bit is substituted for the one first used, inserted in the hole, the rest again placed against a support, and the boring continued for a greater depth. In this way a hole of the desired depth can be made in far less time than with drills now generally in use, the saving of time occurring in the speed with which the parts may be returned to their initial positions. Moreover, the use of springpressed teeth instead of the usual bevel-gearing between the power-wheel and the drill permits the latter to be turned until the head F is almost against the rock, and this will be found to greatly enhance the value of the machine by increasing its boring capacity in cramped places.

The parts may obviously be of any desired materials, proportions, and shapes, and considerable change from the specific construction above set forth can be made without departing from the principle of my invention.

IVhat is claimed as new is 1. In a drill, the combination with a. frame havingahead and foot connected by side bars, said foot having a square central aperture, a square tube sliding through said aperture, guide lugs near its forward end sliding on said side bars, a rest at its rear end, a nut in its front end, and a set screw holding the nut removably in place; of a shaft journaled through said head and having a threaded rear end passing through the nut into said tube, a

bit-chuck carried by its forward end, and

means for rotating the shaft in either direction, as and for the purpose set forth.

2. In a drill, the combination with a frame having a head, a tube sliding longitudinally within the frame, a nut in its forward end, and a support for the rear end thereof; of a shaft journaled through said head and having a threaded rear end passing through the nut into said tube, a bit-chuck carried by its front end, awheel fast on the shaft and having milled edges, lugs projecting from the front face of this wheel, a handle removably engaging any of said lugs, and means for turning said wheel forward mechanically, as and for the purpose set forth.

3. In a drill, the combination with a nut, means for supporting it, a screw taking there through, a bit carried by the screw, and a wheel also carried by the screw and having grooves in its face; of a power wheel at right angles to the grooved wheel, a crank therefor, and spring-actuated teeth in its edge adapted to engage said grooves on the forward turning of the crank only, as and for the purpose set forth.

4:. In a drill, the combination with a nut, means for supporting it, a screw taking therethrough, a bit carried by the screw, and a wheel having a milled edge also carried by the screw and provided in its rear face with radial ratchet-grooves, and on its front face with lugs; of a power wheel havinga squared shaft, a crank handle adapted to fit said squared shaft or the lugs in the grooved wheel, and spring-actuated teeth in the power wheel adapted to engage said grooves only on the forward turning of the crank, as and for the purpose set forth.

5. In a drill, the combination with a nut, means for supporting it, a frame, a screw journaled in the frame and taking through the nut, a bit carried by the screw, and a wheel also carried by the screw and having radial grooves in its face; of a shaft journaled in said frame at right angles to the screw and havinga crank handle, a power wheel fast on the shaft, and spring-actuated teeth in the periphery of this wheel having fiat front faces ICC adapted to engage said grooves on the forward turning of the crank and beveled rear faces adapted to slide over the grooves on the reverse movement, as and for the purpose set forth.

6. In a drill, the combination with aframe, a tube sliding therein and havinga nut in its front end, means for supporting the tube, a shaft jonrnaled in the'frame and having a threaded rear end taking through the nut and passing into the tube, a bit carried by the front end of the shaft, and a wheel fast thereon having a milled edge and provided with radial grooves in its rear face, and lugs projecting from its front face; of a shaft journaled in the frame at right angles to the screw and having a squared outer end, a crank handle fitting such end or the lugs, a power Wheel fast on this shaft, and spring-actuated teeth in the periphery of this Wheel having their outer ends provided with one flat and one beveled face adapted to turn the grooved Wheel on the forward movement only of said crank, as and for the purpose set forth.

7. In a device of the character set forth, the combination with ashaft carryinga wheel with radial grooves in one of its faces; of a power shaft at right angles to the first, a power Wheel thereon having radial cavities, springs in the latter, a tire surrounding the wheel and having openings concentric with but smaller than the cavities, and teeth passing through said openings and having enlarged heads at their inner ends, as and for the purpose set forth.

In testimony whereof I have hereunto subscribed my signature on this the 13th day of August, A.D. 1895.

RICHARD HUFFMAN.

\Vitnesses:

JoHN SCHVVARTZll-IAN, FERD 0. WHITE. 

